Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cc1c187ed86a18…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 16:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ab637bf42f98045f9877e6c9d1dff73 SHA-1: e259e8e39d16a49e62e14cbefd6c7474159256a1 SHA-256: e6cc1c187ed86a1877540c5927135f06b4998d1a05aa5e155974278302d49259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying a large link farm pointing to PDF documents, suggesting a phishing or SEO spam campaign. The presence of a malicious URL and ClamAV detection further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/strik?utm_term=receiver+of+many+book
    • https://cdn-cms.f-static.net/uploads/4469370/normal_602e29aa8011a.pdf
    • https://cdn-cms.f-static.net/uploads/4379500/normal_6021f1db8aa8f.pdf
    • https://cdn-cms.f-static.net/uploads/4485296/normal_602ebe471fa1b.pdf
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5fda10ce26bfa.pdf
    • https://cdn-cms.f-static.net/uploads/4467581/normal_601ab9bcac429.pdf
    • https://cdn-cms.f-static.net/uploads/4366969/normal_602d37025e806.pdf
    • https://cdn-cms.f-static.net/uploads/4485579/normal_603aa4204bfbc.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_6022bb24c9113.pdf
    • https://cdn-cms.f-static.net/uploads/4402501/normal_60541a4ad68ee.pdf
    • https://cdn-cms.f-static.net/uploads/4381294/normal_6051b830c8d1d.pdf
    • https://cdn-cms.f-static.net/uploads/4388271/normal_601c9bfc3c116.pdf
    • https://cdn-cms.f-static.net/uploads/4403141/normal_603f333e280a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xowofalofuzuxis.epizy.com/shorthold_tenancy_agreement_form.pdf
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_6ca747c0e88a4b39a7cc89e831008cd7.pdf?index=true
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_c8ae6c0765544c4a8bc449ba99a7a345.pdf?index=true
    • http://pajomer.epizy.com/fawosezizu.pdf
    • https://uploads.strikinglycdn.com/files/3c1756d1-ab19-4d6c-9a54-59cfb51759c2/wemikonekolaruzulan.pdf
    • https://uploads.strikinglycdn.com/files/c9a52851-03bf-4fd4-b621-f54949629963/what_does_chaos_mean_in_spanish.pdf
    • http://pimewitonuro.epizy.com/altar_de_muertos_elementos_y_significado.pdf
    • http://gekekuvowu.epizy.com/62664526638.pdf
    • https://3211d54f-29bc-45c2-8691-939fa64f7450.filesusr.com/ugd/2e34c2_46dcc5ff1d7a49bca554f1743710b41a.pdf?index=true
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_2ee6c80fdd4742e3b11f606c62c53a9f.pdf?index=true
    • http://taguramol.rf.gd/19240872641.pdf
    • https://uploads.strikinglycdn.com/files/bec88f6c-f379-45e5-a150-f3899824aed8/the_water_is_wide_chapter_3_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec84.bin
6a6ddaf2e22767830ac284043c051dbca4861e1e813f2d83b31109a6fe5e2822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 5188 bytes
font_01_sfnt_off0000fe34.bin
9753585e94dc1ad97beab14b821128e68634ea5ba59a8ed20b3c8a5d6fdbe3af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 11008 bytes

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